The outlier analysis tutorial and templates use the box & whisker plot graph to analyze each data point and flag "High Outlier" and "Low Outlier"  values based on the following two formulas which are applied to the Interquartile Range (IQR) statistic of one column of data:

High Outlier > 75th percentile + 1.5(IQR)
Low Outlier < 25th percentile - 1.5(IQR)

Sort a column of data from the highest to lowest value: the 75th percentile is the value with 75% of the data values below it, and the 25th percentile has 25% of the data values below it. The 75th percentile - the 25th percentile is the Interquartile Range (IQR) statistic of a column of data. The output below is an example summary report generated by completing the Outliers Analysis Tutorial that applies the 1.5(IQR) Outlier Analysis Rule.